Because excess water doesn’t end up in your colon, your kidneys process it and excrete. Only the water needed for the functioning of the colon tissue will be delivered there, through the blood supply to the intestine. You don’t need laxatives; severely constipated patients that for various reasons cannot be given laxatives sometimes end up with physical extraction…it’s extremely unpleasant for both the person doing it, and the patient.
Edited for clarity
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